/Engine/Plugins/Animation/MLDeformer/MLDeformerFramework/Source/MLDeformerFrameworkEditor/Public/MLDeformerEditorModel.h
Sample the vertex deltas between the training base model and target model. This will initialize the sampler if needed and set the sampler space to post-skinning deltas, and then samples them using the sampler. So this will update the internal state of the Sampler member. It will use the current training frame number to sample from. If this number is somehow out of range it will automatically clamp it to be inside a valid range.
virtual void SampleDeltas()